
body {
    height: 700px;
    overflow: scroll;
}
// 头部样式
header {
    height: 48px;
    line-height: 48px;
    font-size: 18px;
}
// 主体样式
main {
    flex: 1;
    background-image: url(../img/advertisement-bg.jpg);
    background-size:1280px;
    background-position: top center;
    background-repeat: no-repeat;
// 标语部分
    .slogan {
        height: 50px;
        animation-name: fadeUp ;
        animation-duration: 3s;
        font-weight: bold;
        bottom: 124px;
        text-align: center;

    }
}

@keyframes fadeUp {
    from {
        opacity: 0;
        font-size: 0;
         bottom: 124px;
    }

    to {
        opacity: 1;
          font-size: 30px;
        bottom: 164px;
    }
}
// 倒计时
#adBtn {
    width: 90px;
    height: 40px;
    line-height: 40px;
    border-radius: 20px;
    top: 30px;
    right: 30px;
}